Software must be disallowed to run or install with invalid signatures.

From Microsoft Internet Explorer 10 Security Technical Implementation Guide

Part of DTBI350 - Software with invalid signatures

Associated with IA controls: DCMC-1

SV-45311r1_rule Software must be disallowed to run or install with invalid signatures.

Vulnerability discussion

Microsoft ActiveX controls and file downloads often have digital signatures attached that certify the file's integrity and the identity of the signer (creator) of the software. Such signatures help ensure unmodified software is downloaded and the user can positively identify the signer to determine whether you trust them enough to run their software. The validity of unsigned code cannot be ascertained. Some legitimate software and controls may have an invalid signature. You should carefully test such software in isolation before it is allowed to be used on an organization's network.

Check content

Fix text

Set the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer -> Internet Control Panel -> Advanced Page -> "Allow software to run or install even if the signature is invalid" to "Disabled".

Pro Tips

Lavender hyperlinks in small type off to the right (of CSS class id, if you view the page source) point to globally unique URIs for each document and item. Copy the link location and paste anywhere you need to talk unambiguously about these things.

You can obtain data about documents and items in other formats. Simply provide an HTTP header Accept: text/turtle or Accept: application/rdf+xml.